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https://issues.apache.org/jira/browse/AIRFLOW-1500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120630#comment-16120630
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Matt Land commented on AIRFLOW-1500:
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We had a similar need- to patch the environment variables at run time.
We achieved it by extending the DockerOperator into a new class in
/airflow/plugins, and evaluate the xcom in the pre_execute hook.
> Allow dynamic assignment of volumes in DockerOperator
> -----------------------------------------------------
>
> Key: AIRFLOW-1500
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1500
> Project: Apache Airflow
> Issue Type: Improvement
> Components: docker
> Reporter: Gerald Vasend
> Priority: Minor
>
> Currently the DockerOperator allows dynamic command modification via
> literal_eval allowing injection of xcom variables. Would like to do the same
> for volumes. I have tried using a function but need task_instance to access
> xcom and it is not available outside execution of the operator
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